<!DOCTYPE html>
<html lang="zh-CN">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <div id="app">
        <ul>
            <li v-for="(item,index) in arr" :key="item.id">{{item}}</li>

        </ul>
        <button @click="btn">走一走</button>
    </div>
    <script src="../vue.js"></script>

    <script>
        const app = new Vue({
            el: '#app',
            data: {
                arr: ['帅哥', '美女', '程序员'],
            },
            methods: {
                btn() {
                    this.arr.push(this.arr.shift([0]))
                    console.log(this.arr)
                }
            }
        })



    </script>
</body>

</html>